Author Topic: Siglent SDL1000X/SDL1000X-E Electronic Load  (Read 117453 times)

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Offline CM

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Re: Siglent SDL1000X/SDL1000X-E Electronic Load
« Reply #400 on: August 06, 2024, 09:51:21 pm »
I am using an Agilent E3633A to supply power.  I am measuring voltage at the terminals of the SDL using a calibrated Agilent 34401A 6.5 digit multimeter.  I'm about 3% off at all voltages I've tested.  The specification for voltage is +/- 0.02% + 0.05% FS, so that strikes me as way off.
 

Online tautech

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Re: Siglent SDL1000X/SDL1000X-E Electronic Load
« Reply #401 on: August 06, 2024, 09:52:12 pm »
I am supplying power to the load by an Agilent E3633A power supply.  I am measuring voltage at the SDL input terminals using a calibrated Agilent 34401A 6 1/2 digit multimeter.  I'm about 3% off on all the voltages I've tested.  The specification for voltage accuracy is +/- 0.02% +0.025%FS._At no input, the SDL still shows .003V.
So will a sensitive DMM in a noisy lab.
Test with a input short.
https://int.siglent.com/u_file/download/23_04_12/SDL1000X%20Series%20Service%20Manual_E01B.pdf
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Offline CM

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Re: Siglent SDL1000X/SDL1000X-E Electronic Load
« Reply #402 on: August 06, 2024, 10:01:25 pm »
I have retested by shorting the inputs.  Still shows 0.003V.  Seems off to me.   Thank you for providing version E01B of the service manual.  While it provides the verification procedures, I'm kinda disappointed that Siglent no longer provides the calibration procedures.
 

Offline Martin72

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Re: Siglent SDL1000X/SDL1000X-E Electronic Load
« Reply #403 on: August 06, 2024, 10:11:58 pm »
Quote
I'm kinda disappointed that Siglent no longer provides the calibration procedures.

Because it is not very easy and had caused more problems than results, it was consequently withdrawn.
I personally do not trust the displayed values of loads and supplies for professional reasons alone and would always use "correct" meters for current and voltage measurements.

Online tautech

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Re: Siglent SDL1000X/SDL1000X-E Electronic Load
« Reply #404 on: August 06, 2024, 10:21:58 pm »
I have retested by shorting the inputs.  Still shows 0.003V.  Seems off to me.   Thank you for providing version E01B of the service manual.  While it provides the verification procedures, I'm kinda disappointed that Siglent no longer provides the calibration procedures.
In which modes ?
See datasheet for accuracy qualifications.
https://int.siglent.com/u_file/download/24_06_06/SDL1000X_DataSheet_DS0801X-E01F.pdf
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Offline CM

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Re: Siglent SDL1000X/SDL1000X-E Electronic Load
« Reply #405 on: August 06, 2024, 11:16:16 pm »
Tell me one mode where a 3% error for a voltage reading is acceptable.  Where in the user or service manual does it warn you to expect a 3% difference between the display and what you would acquire by a SCPI command? 
 

Online tautech

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Re: Siglent SDL1000X/SDL1000X-E Electronic Load
« Reply #406 on: August 06, 2024, 11:19:03 pm »
Tell me one mode where a 3% error for a voltage reading is acceptable.  Where in the user or service manual does it warn you to expect a 3% difference between the display and what you would acquire by a SCPI command?
Ask NA HQ if they will check Cal for you.
https://siglentna.com/contact-us/
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Offline CM

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Re: Siglent SDL1000X/SDL1000X-E Electronic Load
« Reply #407 on: August 06, 2024, 11:53:36 pm »
I was testing in CV mode in the 0 to 36V range.  Looking at the spec, the accuracy for 0 volts is +/- 0.0005 + 0.00025 FS.  If I understand this correctly, full scale is 36V, so 0.00025 of FS is 9mv.  That's more than the 0.003V I observed.  After leaving the SDL on for 2 hours, no-load reading dropped to 0.001V.  If I did this right, it is in spec.  It would be interesting to compare the display readings with SCPI readings.
« Last Edit: August 08, 2024, 06:15:54 pm by CM »
 
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Offline Martin72

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Re: Siglent SDL1000X/SDL1000X-E Electronic Load
« Reply #408 on: August 07, 2024, 07:21:54 pm »
Can you please repost the service manual?

Here we go, once again...
 
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Offline mawyatt

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Re: Siglent SDL1000X/SDL1000X-E Electronic Load
« Reply #409 on: August 07, 2024, 08:04:38 pm »
Can you please repost the service manual?

Here we go, once again...

One should be very cautious with this, and can understand why Siglent removed this procedure.

This is confusing and complicated for Instrument Calibration. Not something we're going to be attempting anytime soon, unless Siglent issues a more clear version, and/or someone creates a clearer procedure!!

Best,
Curiosity killed the cat, also depleted my wallet!
~Wyatt Labs by Mike~
 
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Offline Martin72

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Re: Siglent SDL1000X/SDL1000X-E Electronic Load
« Reply #410 on: August 07, 2024, 09:06:14 pm »
When I requested the "uncut" manual from Siglent, I received it straight away, presumably because I am in contact with the support team at work and they know that I won't tell them off if a calibration goes wrong. ;)
Because there had been problems in the past, so they decided to remove the part from the manual.
I also can't imagine that Siglent only assigns staff to make the procedure "fool proof".
In other words, it will remain as it is now, without calibration instructions.
I could look into it and create a more brain-friendly manual, but I would need time that I don't have, because there are already too many "projects" in my pipeline and such a calibration would definitely be low priority.
In addition, I personally only trust displays from external measuring devices anyway and never rely on the internal displays of loads/generators/supplies.
This is also how "my" test field is set up at work.
Oscilloscopes, multimeters, power analyzers, data recorders, current clamps and differential probes are calibrated, everything else is not.
I "turned" my 1020 into a 1030 last and saved a lot of money and I'm not the only one who did that.
So you could go along and spend some of the money saved on an external calibration.
Because the guys from a measuring laboratory must be able to do this, they not only get the specs from the manufacturer, but also calibration instructions if available.
 
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Offline colorado.rob

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Re: Siglent SDL1000X/SDL1000X-E Electronic Load
« Reply #411 on: August 30, 2024, 08:00:57 pm »
Got an early Christmas present today -- the SDL1020X-E arrived and is on the network.

@Tautech -- one request to Siglent: Please add support for the SCreenDumP (SCDP) SCPI command to the SDL1000X. I was rather disappointed to find it missing from the programming guide.

The odd thing is that when I send the command, I get a success code, but then 0 bytes are returned.  I was hoping that, like with the SDM3065X, it might be an undocumented command.

@Tautech -- any update on this feature request?  I wish to use the SDL1000X to document battery capacity and discharge characteristics. I would prefer to just grab a screenshot via SCPI of the final results rather than having to either taking a photo (ugh!) or dumping the raw data and plotting the results. Lack of screenshot capability in any modern piece of test equipment is just bizarre.

Second request -- on the battery discharge screen, please show total power in mWh, along with the mAh. I am trying to test a battery with a non-linear voltage curve when discharged at a constant current. Having the instrument do that calculation for me would be helpful.
 
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Offline Martin72

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Re: Siglent SDL1000X/SDL1000X-E Electronic Load
« Reply #412 on: November 03, 2024, 08:10:32 pm »
For another thread (looking for a current clamp), I finally used the load. :-X ;)
Oh dear, the DC current has a ripple superimposed on it.
Closer examination showed that it is a 100Hz signal, i.e. a mains ripple, that somehow interferes with the generated current.
To rule out the connected power supply as the cause, I had ordered a 12V battery, which arrived yesterday.
I connected it earlier today and lo and behold, the current remains unchanged, the ripple remains, so it is definitely due to the load.
I will investigate this in more detail soon, to find out where it comes from and how it can be reduced or even eliminated.
User nctnico had already done excellent “preparatory work” in this regard, as he noticed something similar with his DC load.
I'll check this out first, because the transformer from the Siglent load is mounted at the front, its lines are routed over part of the circuit board.

Martin
« Last Edit: November 03, 2024, 10:01:17 pm by Martin72 »
 
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Online Tjuurko

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Re: Siglent SDL1000X/SDL1000X-E Electronic Load
« Reply #413 on: November 05, 2024, 03:48:58 am »
Now I received SDL1020-X from China.
输入端子透明防护罩(上壳+下壳) [Input terminal transparent protective cover (upper shell + lower shell)] were added to the kit. There is not a single image of this detail on the Internet.
 
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Offline Mortymore

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Re: Siglent SDL1000X/SDL1000X-E Electronic Load
« Reply #414 on: November 05, 2024, 09:59:37 am »
Now I received SDL1020-X from China.
输入端子透明防护罩(上壳+下壳) [Input terminal transparent protective cover (upper shell + lower shell)] were added to the kit. There is not a single image of this detail on the Internet.

It would be nice if Siglent could provide the files to 3D print it  ;D

Online Tjuurko

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Re: Siglent SDL1000X/SDL1000X-E Electronic Load
« Reply #415 on: November 13, 2024, 06:51:22 am »
I tried the various capabilities of SDL1020X-E and share my impressions:

1. Everything control was carried out remotely, the screen SDL1000X is practically not used.
2. The software transformation 1020 in 1030 is successful, but after "Reset the System to the Default Settings" the "P_Protect" field is dropped by 200.000W (it has to be manually installed on 300.000W).
3. The minimum step setting step is ~0.098 mA (5A) and ~0.490 mA (30A). It was checked by the command ":SOURce:CURRent:LEVel:IMMediate <value>", <value> changed in steps 0.00001, the real measurement of the current was carried out by the SDM3065X.
4. Measurement of current and voltage (commands "MEASure:CURRent:DC?" and "MEASure:VOLTage:DC?") SDL1000X is carried out according to the scheme: Scaling (5/30A or 36/150V) -> ADC -> the average point 2^6...2^14 -> DAC (output "V Monitor" and "I Monitor").
5. The average point 2^6 ... 2^14 affects the speed: for 2^14, the time of receipt is equa is 800 ms, 2^13 - 400 ms (this is clearly visible on the outputs of "V Monitor" and "I Monitor").
« Last Edit: November 13, 2024, 06:55:08 am by Tjuurko »
 
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Online Tjuurko

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Re: Siglent SDL1000X/SDL1000X-E Electronic Load
« Reply #416 on: November 18, 2024, 10:14:12 am »
SW Version ID: 1.1.1.23R2
HW Version ID: 05-04-024
Production ID: SDL1020X-E

After experiments with the Micsig CP2100A and Siglent SDL1020X-E, one feature was discovered: large current pulsations (±4%) with the frequency of ~25.5kHz in all static modes: CC, CP, CR.

Then I remembered one "mysterious" setting ("Slew_RIS" and "Slew_FAL") in the CC menu:


Results of various modes (in all modes, the current was selected at ~3A):

CP 10W
2439721-1

CC 3A Slew_RIS=2.500A/us and Slew_FAL=2.500A/us
2439725-2

CC 3A Slew_RIS=0.001A/us and Slew_FAL=0.001A/us
2439729-3

CR 1.139R
2439733-4

Is it possible to somehow get rid of these pulsations?
« Last Edit: November 18, 2024, 10:28:03 am by Tjuurko »
 

Offline Joe1vm

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Re: Siglent SDL1000X/SDL1000X-E Electronic Load
« Reply #417 on: November 18, 2024, 07:41:04 pm »
I guess you can see the ripple at this frequency when you connect the oscilloscope directly (in parallel) to the load...
 

Online Tjuurko

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Re: Siglent SDL1000X/SDL1000X-E Electronic Load
« Reply #418 on: November 20, 2024, 04:13:36 am »
Now I checked the work "Maynuo MN-M9812" and found a similar effect with a small input voltage.
On "Maynuo MN-M9812" this effect is much weaker.

Specially selected parameters for strengthening "pulsations" Siglent SDL1020X-E:
"CC mode" I_Range=30A V_Range=150V Current=2.500A Slew_RIS=0.015A/us Slew_FAL=0.001A/us

The measured voltage on the Siglent SDL1020X-E screen was about 0.170V
The measured current was 2.700A
« Last Edit: November 20, 2024, 04:27:15 am by Tjuurko »
 

Offline Martin72

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Re: Siglent SDL1000X/SDL1000X-E Electronic Load
« Reply #419 on: November 20, 2024, 10:04:20 pm »
Tell us about your setup.
Which source is used for example.

 
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Online Tjuurko

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Re: Siglent SDL1000X/SDL1000X-E Electronic Load
« Reply #420 on: November 25, 2024, 10:13:43 am »
Any power supply with an output voltage of 0...1V and current 2A. The assembly of 10 capacitors 2200 μF is connected to the power supply.
SDL1020X-E is connected to the assembly of capacitors with thick wires (2x1 meter 10AWG).
By adjusting the voltage at the output of the power supply, this effect can be achieved.

This effect is achieved only in the area of ​​small low voltage.
« Last Edit: November 25, 2024, 10:16:46 am by Tjuurko »
 

Offline Martin72

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Re: Siglent SDL1000X/SDL1000X-E Electronic Load
« Reply #421 on: November 25, 2024, 01:55:23 pm »
This makes sense because you are charging the capacitors, which absorb more current when the voltage rises.
You should also have the same effect when using a normal load resistor.


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